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Finding the Fourth Proportional to 816.19, 1,223.60 and 404.77

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Solution

The fourth proportional to 816.19, 1,223.60 and 404.77 is: 606.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.19 : 1,223.60 = 404.77 : x
  2. Step 2: Convert to fraction form
    816.19/1,223.60 = 404.77/x
  3. Step 3: Cross multiply
    816.19x = 1,223.60 × 404.77
  4. Step 4: Simplify right side
    816.19x = 495,274.55
  5. Step 5: Solve for x
    x = 495,274.55/816.19
  6. Step 6: Final answer
    x = 606.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.